用脉冲激光沉积法在Si(111)衬底上制备了ZnO薄膜.RHEED和XRD测试表明,直接沉积在Si衬底上的ZnO薄膜为多晶薄膜,且薄膜的结晶质量随衬底温度的升高而下降.相比之下,生长在一低温同质缓冲层上的ZnO薄膜则展现出规则的斑点状RHEED图像,说明它们都是外延生长的高质量ZnO薄膜.XRD与室温PL谱分析表明,外延ZnO薄膜的质量随衬底温度的升高得到明显的改善.在650℃生长的样品具有最好的结构和发光特性,其(002)衍射峰的半高宽为0.185°,UV峰的半高宽仅为86meV.
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